Still, L-theanine supplementation on its own helps you fall asleep faster. 3 L-theanine acts on neurons to influence brain wave activity, encouraging relaxation and reducing stress and anxiety. It ...

Drinking green tea with L-theanine can cause calm alertness because the caffeine in the tea wakes you up, while L-theanine promotes relaxation.

Research suggests a daily supplementation of 200 to 400 milligrams per day of l-theanine is optimal for reducing stress. Studies using these amounts and even lower doses of L-theanine all show ...